I have a 2001 mustang and dual exhaust, I have decided to cut off the converters and replace them with pipe. When I do that should I replace all 02 sensors? They are original I believe, also does the eliminators go on the 02 behind the converters? Or in front

If your taking off the cats and replacing with regular pipes your going to have to drill holes for the o2's I would just get a O/R pipe just my 2 cents. And yes MIL eliminators will be need for the rear 2 cats